The following diagram shows a 60^{\circ}, 30^{\circ}, 90^{\circ} glass prism of critical angle 42^{\circ}. Copy the diagram and complete the path of incident ray A B emerging out of the prism marking the angle of incidence on each surface.

ICSE Class 10 Physics 2018 Solved Paper - Question 19

Question : 19 of 78

Marks: +1, -0

The following diagram shows a

60^{∘}, 30^{∘}, 90^{∘}

glass prism of critical angle

42^{∘}

. Copy the diagram and complete the path of incident ray

A B

emerging out of the prism marking the angle of incidence on each surface.

Solution:

For refracting surface

{\YZ}, ∠ i=0^{∘}

For refracting surface

{\XZ}, ∠ i=30^{∘}

Since

∠ i< ∠ i_c, ∴

the ray bends away from the normal.

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